Pre-Diagnosis Inspection
NOTE:
When servicing ABS, following steps should be followed in order. Failure to follow these steps may result in loss of important diagnostic data, and lead to difficult and time consuming diagnostic procedures.
- Perform a vehicle preliminary diagnosis inspection. This should include following:
- Check master cylinder fluid level. Check brake fluid for signs of contamination.
- Check brake pressure modulator for leaks or wiring damage.
- Check brake components at all 4 wheels. Ensure brakes apply properly and no drag exists.
- Check for worn or damaged wheel bearings.
- Check wheel speed sensors and wiring. Ensure sensors are securely attached and toothed ring is not damaged.
- Ensure tires meet legal tread depth requirements.
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK .